Drill-driving mechanism.



H. B KEIPER.

DRILL DRIVSNG MECHANISM.

APPLICATION FILED APR. 13, 19I2.

. 1,137,330. Patented Apr. 27, 1915.

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DRILL DRIVING MECHANISM.

APPLICATION FILED APR. 13. 1912.

1,137,330. Patented Apr. 27, 1915.

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DRILL-DRIVING MEGHANISM.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed April 13, 1912. Serial No. 690,661. I

To all whom, it may concern:

Be it known that I, HENRY B. KEIIER, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Drill- Driving Mechanism, of which the following is a specification.

This invention relates to machine drills, especially to the driving mechanisms of the same.

The primary object of the invention is to provide a drill of very simple and compact construction, in which worm gearing of novel arrangement together with a suitable housing therefor are utilized and so combined with a motor as to permit of the employment of a direct connection between the motor and worm gearing and a universal joint in said connection so as to insure the proper operation of the drill in'spite of shifts in the alinement of the motor.

Further objects are to provide for changing the speed of the drill without stopping or altering the speed of the motor, and to improve the lubrication of the driving mechanism.

A characteristic feature of the present invention is that the driving connection is made between the fly wheel shaft, commonly known as the back gear shaft, which permits of a ready shifting from light to heavy drilling, that is to say, from a small hole, to a larger one, without change of speed of the fly wheel shaft.

The invention will first be hereinafter more particularly described with reference to the accompanying drawings, which form a part of this specification, and then pointed out in the claims at the end ofthe description.

In the drawings, in which similar letters of reference are used to denote corresponding parts in the several views, Figure 1 is a side elevation of the upper portion of a machine drill embodying my invention;

gear casing, to more clearly illustrate the oil duct.

Referring to the drawings by letters of reference, the letter A designates the frame of the drill which may be conveniently secured to a suitable support such as B. Journaled in the frame are two vertical shafts C and D, the former carrying a fly wheel E and hereinafter called the fly wheel shaft. The other shaft D carries the drill chuck F. The shaft G carries variable speed gears G adapted to mesh with corresponding gears H on the shaft D whereby the speed of the latter shaft may be altered to accommodate different sizes of drills without stopping or changing the speed of the fly wheel shaft.

A horizontal casing I is supported in a suitable manner on the frame A, as by the bracket J, in position to surround the fly wheel shaft which passes up through the same. Said casing houses a worm gear or wheel K, mounted on said shaft, and a worm L meshing with said worm gear; An electric motor M is conveniently mounted on the frame of the drill and is connected directly to the worm by means of a shaft having a universal joint N, which insures the even running of the worm even though the motor should be jarred out of exact alinement therewith. The journals for the worm are preferably seated in ball-bearings of a known type to reduce friction.

The casing I is constructed with an approximately cup-shaped portion inclosing the worm-wheel and'with an integral tubular portion 0 at one side thereof opening intothe cup-shaped body and inclosing the worm L in mesh with said worm-wheel; and in order to afford access to the interior of the casing and the gearing housed therein and to insure the proper lubrication of the worm and worm-wheel, said cup-sl1aped body is provided with a removable cover and with an oil cup P around the lower end of the hub Q of the worm-wheel, while said tubular portion 0 has its bottom arranged below the bottom of the cup-shaped portion of the casing, thus providing an oil receiver underlying the worm. A bushing R is fitted around the fly wheel shaft within the top of the casing I which may be extended surface of said sleeve.

thereto, said key being introduced at the upper end of the bushing and provided with a head U which abuts against the; same when said key is in position. A screw V inserted through the head of the key into the bushing will prevent said key from working loose in operation. The bushing is provided with an outwardly extending flange 1V which covers the upper end of the sleeve S and thus excludes dust and other foreign matter from entering the casing 1. An adjustable spring-pressed pin X is fitted in a radial passage in the bushing and normally engages a recess Y in the fly wheel shaft for normally holding said bushing down upon said sleeve. 7

The bushing, which it will be remembered revolves with the shaft, is further provided with an oil duct Z which may enter its upper end, as clearly illustrated in Fig. 4, and terminate in a spiral open groove a on its outer surface, whereby the oil will come into direct contact with the interior of the stationary sleeve S and be fed downward along the same into the casing I. Said groove a preferably extends substantially the full length of the bushing thus afiording ample lubrication for the entire inner The juncture of the oil duct proper and the groove a is on the under surface of the flange W so that part of the oil will lubricate the bearing of said under surface upon the upper end of the sleeve S.

The universal joint connection between the motor and worm insures a very compact structure, and the drill operates with little friction.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent is:

1. In combination, a shaft, a worm-wheel thereon, a shaft carrying a worm engaging said worm-wheel, a motor having a direct connection with said worm-shaft, said con-.

nection including a universal joint between said motor and said worm, and'a housing for said worm-wheel and worm consisting of a horizontally disposed approximately cupshaped casing inclosing said worm-wheel; said casing being provided with a removable cover and having at one side thereof an integral tubular portion opening into'the adj acent cup like body of the casing and inclosing the worm on said worm-shaft.

2. In combination a driven shaft, a driving shaft, a worm-wheel on said driving shaft, a shaft having a worm thereon engaging said worm-wheel, and a housing for said worm-wheel and worm, comprising a substantially cup-shaped casing inclosing said worm-wheel and having a detachable cover; said casing also having an integral tubular portion opening into itat one side thereof and extending substantially at right the lower end of the hub of the worm gear,

whereby the oil is retained in contact with the bearing faces of said hub and the bottom of the casing.

4. In a drill, the combination with a vertioal driving'shaft, of a horizontal casing surrounding said shaft, a worm gear mounted in said casing around the shaft and adapted to rotate with the latter, and a worm also arranged in said casing and meshing with said worm gear, a bushing fitted around the shaft and in thetop of the casing, said worm gear and bushing being splined-c to the shaft by a single key passed through both.

5. In a drill, the combination with a vertical driving shaft, of a horizontal casing surrounding said shaft, a gear mounted in said casing around the shaft and adapted to rotate with the latter, means to' drive said gear, and a bushing fitted around the shaft in the top of the casing to rotate with said shaft, said bushing having an oil duct entering its upper end portion and adapted to deliver onto the bearing surfaces between said bushing and casing.

6. In a drill, the combination with a vertical shaft, of a horizontal casing surrounding said shaft, a gear mounted insaid casing around the shaft and adapted to rotate with the latter, means to drive said gear, and a bushing fitted around the shaft in the top of the casing to rotate with said shaft, said bushing having an oil duct entering its upper end portion and terminating in an elongated spiral groove on its outer surface within its bearing in the casing.

of the casing to rotate with saidshaft, said bushing having a flange extending outwardly at the top of the casing and an oil duct entering said flange and terminating in an open groove on the outside of the bearing surface of the bushing in the top of the casing, the juncture of said duct proper and groove being located on the under surface of said flange, for the purpose specified.

8. In a drill, the combination with a shaft having a recess therein, of a casing surrounding said shaft, a gear mounted in said casing around the shaft and adapted to rotate with the latter, means to drive said 5 gear, a bushing fitting around the shaft in wheel carried by said driving shaft ofa motor-driven shaft having a worm thereon engaging'said worm-wheel and extending substantially at right angles to said driving shaft, together with a casing wherein said worm-wheel andworm are housed, said casing having an oil cup encircling said driving shaft, and an elongated recess or depression forming an oil receptacle underlying said worm.

10. In combination with a drillshaft, a driving shaft geared thereto anda wormwheel carried thereby, a motor-driven shaft having a worm thereon engaging said wormwheel, and means for housing, journaling and lubricating said shafts, comprising a casing provided with bearings for said worm-wheel shaft and said motor-driven shaft both of which extend therethrough, said casing having an oil cup encircling said worm-wheel shaft and an oil recess underlying the worm on said motor-driven shaft, together with anti-friction hearings on said casing for said motor-driven shaft in communication with said oil recess.

11. In combination with a driven shaft and a driving shaft geared thereto; a wormwheel on said driving shaft, a worm-shaft having a worm thereon in mesh with said worm-wheel, a motor havinga direct connection with said worm, and a housing for said worm-Wheel and worm consisting of a substantially cup-shaped casing inclosing said worm-wheel and having a removable cover; said casing being constructed with an integral tubular portion opening into it at one side thereof and inclosing said Worm and with an oil cup underlying the hub of said worm-wheel.

HENRY B. KEIPER.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 3!). 0. 

